Feather Dusters?

[KJones90s]

Growing all over the baffles in my sump and refugium.
are these a nuisance pest or should I just leave them be?
I would hate to have a DT full of them.

 

[C. Eymann]

Pineapple sponges, good little filter feeders.

 

[X-37B]

Pineapple sponges, good little filter feeders.

I have them to in my oveflow and sump and none in the display tank
They thrive in a no light area.

 

[Auquanut]

^^ Yep. What they said.

 

[KJ]

They thrive in a no light area.

Yes.

 

[jeffchapok]

I consider them free filtration.